Write a function in MATLAB without using built-in functions (do not use dec2bin or others) for the following: Convert a decimal number to binary, octal or hexadecimal. Also, convert from binary, octal, or hexadecimal to decimal.

Write a user-defined function in python that will accept five(5) numbers and calculate the sum, average, and product of those numbers that are less than or equal to 50 and greater than or equal to 25.

Define a function calc_total_inches, with parameters num_feet and num_inches, that returns the total number of inches. Note: There are 12 inches in a foot.Sample output with inputs: 5 8 Total inches: 68

Write a function definition for a bool function called isEven. This function takes an integer value parameter, and returns boolean value true if the parameter is even and false if it is odd. Write a simple driver program to test your function. Show your full source code and a screenshot of your output.

Write a python function that takes two very large integers as input and returns their sum. You can only use plain Python and no Bignum data types.